Solar Attic Fanatics are easily installed and a perfect product for correct attic ventilation. Natural Light brand solar attic fans are high rated through builders and are the best quality inbuilt the United States! The DC motor is powered via the integrated sunlight panel with the attic fan motor shifting hot air and moisture out of the attic space everyday. Sunlight panel is adjustable from flat up to 45 stage attitude or can be indifferent and mounted remotely for very best solar exposure. Sun Attic Fans mount on three/12 to 12/12 pitch roofs. (this unit no longer for flat roofs or aspect wall mounting). Strikes up to 850 cubic toes per minute. Use one attic air flow fan for every 1200 square feet of attic area. Notice: Purchase the not obligatory Sunlight Attic Fan Thermostat if to be used in areas with cold wintry weather temperatures. See Giant Frog Mountain Amazon Storefront for this non-compulsory phase.